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Patent Searching and Data


Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/130451
Kind Code:
A1
Abstract:
The purpose of the invention is to allow operability to be improved by controlling speed variations of an actuator into which a reclaimed flow flows regardless of fluctuations in the reclaimed flow due to changes in the orientation of a front part when the front part moves in a freefall direction and pressurized oil discharged from the actuator driving the front part is reclaimed. For this purpose, a reclamation control arithmetic logic unit 19b and a pump flow rate control arithmetic logic unit 19c are provided in a controller 19 for a hydraulic system. When the reclamation control arithmetic logic unit controls a reclamation valve 12 and performs reclamation, the pump flow rate control arithmetic logic unit controls, on the basis of orientation information of an arm 16 acquired by an inertial measurement device 31, a pump flow rate control device 20 so that the delivery flow rate of a hydraulic pump 1 increases as the direction of the arm 16 nears the vertical down direction.

Inventors:
OGAWA Yuichi (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
IMURA Shinya (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2017/046802
Publication Date:
July 04, 2019
Filing Date:
December 26, 2017
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
E02F9/22; F15B21/14
Foreign References:
JP2012237339A2012-12-06
JP2008128464A2008-06-05
JP2004270924A2004-09-30
JPH11311205A1999-11-09
JPH08219121A1996-08-27
JPH04185903A1992-07-02
JP2011220356A2011-11-04
EP2636910A12013-09-11
Attorney, Agent or Firm:
KAICHI IP (3-16, Nihonbashi-muromachi 4-chome Chuo-k, Tokyo 22, 〒1030022, JP)
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